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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '098d617251851d6a93c5a16009b2ca8af16efa9808678e2ba1ef1157fe864799' 
  AND token = 'tcNJCPJQ9LYnAPZ7It+9JPCG3/8dvlFuUSnV2UfZCWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}